Pendulum-escapement.



No. 633,938. Patented Sept. 26, I899. C. T. E.'ZIMMEBMAN.

PENDULUM ESCAPEMENT.

(Application Med Apr. 5, 1899.)

(No llodal.)

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UNITED STATES PATENT Fries.

CARL T. E. ZIMMERMAN, OF CUMBERLAND, IVISCONSIN.

PENDULUM-ESCAPEMENT.

SPECIFICATION forming part of'Letters Patent No. 633,938, dated September 26, 1899.

Application filed April 5,1899. Serial No. 711,822. KNO model-l To a whom it 'lmty non/warn..-

Be it known that I, CARL T. E. ZIMMERMAN, of Cumberland, in the county of Barron and State of Wisconsin, have invented a new and useful Improvement in Olock-Escapements, of which the following is a specification.

The ordinary time-clock does not keep correct and uniform time for the reason that when the spring is wound up it runs at first with the full tension of this spring and runs fast, while when nearly run down the tension of the spring is so relaxed that the clock runs slow.

My invention is designed to overcome this objection, and to that end it consists in a pcculiar construction and arrangement of the parts of an escapement so combined with the pendulum and an escapement-wl1eel that the pendulum is not actuated by the eseapementwheel and the power of the mainspring,whieh is a variable factor, but by an intermediate weight set into action by the escapementwheel and falling from gravity with a constant force to uniformly actuate the pendulum, as will be hereinafter more fully described with reference to the drawings, in whicl Figure 1 is a front elevation of the escapement. Fig. 2 is a similarview showing a different position of the parts. Fig. 3 is an edge view looking in the direction of the arrow 8 in Fig. 1.

In the drawings, A represents the escapeinent-wheel of any clock mechanism.

B is the pendulum-bar, connected bytwo plates 0" r to a suspending-spring s, which is supported by a stationary pin q. The pendulum-bar is offset at its upper end and is extended above its center of oscillation in the form of an upward extension at, having midway its length a right-angularly-projecting arm formed by a bar 0 and a subjacent flat I,

elbow-lever, whose arms are arranged at an angle of about forty-five degrees to each other and are rigidly connected together at u, about which point said elbow-lever oscillates. On the outer end of arm h is a laterally-projecting pin 7. of a D-shaped cross-section, that engages with the teeth of the escapementwheel, and on the outer end of arm g there is a laterally-projecting pin f, that rests 011 top of an arm c. This arm 6 is one of four arms c (I e Z), rigidly connected together and turning about a center t. b is screw-threaded at its outer end and has an adjustable weight a on it, whose gravity in falling actuates the pendulum. c is the tappet-arm that strikes the pendulum extension at and actuates the pendulum, and (Z is the pallet for the teeth of the escapement-wheel.

In operation the action of the escapement is as follows: Vhen the pendulum is started in the direction of the dotted arrows, Fig. 1, the thin spring 2) underarm 0 presses against arm Z and releases arm j from pallet d, letting said pallet (Z drop from influence of weight a against escape-tooth 1. Atthe same time arm 0 strikes pendulum extension n, giving impulse to the pendulum in the same direction of dotted arrows. Also in the same movement arm 0 presses against pin f and lifts arm 71., with stop-pin 7t, from escape-tooth 2, letting the wheel move in the direction of the full-lined arrow one tooth. In this movement tooth 1 forces pallet (1 back in position to be caught by arm j, again raising weight a and holding it ready to be released again with the next swing of the pendulum.

1 is a piece of metal fastened to the plate of the clock between arms 7t and j to keep said arms 7t and j inproper position.

at is a Hat spring pressing against a flattened surface on the arbor t to force arms Z and 7' into proper position.

In Fig. the pendulum has received its impulse from tappet-arm c and teeth 2 has been released from pin 7.; and is resting against pallet d ready to carry it back in locked position behind arm j, after which arm 71, with pin It, falls into position to receive and hold tooth 3 until released by the next motion of the pendulum. The projection a; of the pallet acis as a stop, striking pin 7. on arm 71 As thus described, it will be seen that the power to actuate the pendulum is simply the constant and unchanging gravity of weight.

ICO

I elaim as now, an d desire to secure by letters Patent, is

1. Aclock-escapement,comprisinga toothed eseapement-wheel, an oscillating pendulum, an oscillating weight, and stop and trip mechanism for the escapement-wheel connecting these three elements as described, whereby only the oscillating weight is made to swing the pendulum, and the pendulumis arranged to trip the stop mechanism as and for the purpose set forth.

2. A clocleeseapement,comprising a toothed escapemerit-wheel, an oscillating pendulum, a four-armed oscillating piece, one arm of which carries a weight, another arm of which applies the force of the fall of said weight to actuate the pendulum, a third arm being fashioned as a pallet to be vibrated by the escapement-wheel, and the fourth arm acting as a tripping; device, an elbow lcvcr having one arm operated upon by said fourth arm of the four-armed piece, and the other arm provided with a stop for the escapementwheel, and a second elbow-lever, one arm of which is operated upon by the pendulum, and the other arm of which looks the pallet substantially as and for the purpose described.

3. A cloch-escapement,comprising a toothed escapementavheel, a pendulum with extension '21 and right-angular spring-arm 01) above its center of oscillation, the four-armed piece (1 0 (Z c, the arm I) having an adjustable weight, the arm (I being in the nature of a pallet, and the arm 0 extending to contact with the pendulum extension n, the elbow-lever g 71, the arm 5 of which is extended to contact with e, and the arm 7L having on its end a stop-pin L for the teeth of the escapement-wheel, the elbow-lever 7' and spring m for holding it in position, the arm j acting to lock the pallet, and the arm Z extending to cooperation with the spring-arm o p, and the stationary stop-piece t' substantially as and for the purpose described.

CARL T. E. ZIMHERMAN.

Witnesses:

JAY S. HAMILTON, .JENS Swanson 

